Ugh, you excitable people!
This is meaningless.
Nintendo submitted both devices to the FCC back in September.
The
regular New 3DS on 9/24/14 and the
New 3DS XL on 9/25/14.
All that's happened here is the photos they submitted to the FCC have run out of their confidentiality period.
Both of them were submitted with some aspects of the submission being confidential until 3/23/15. I think this is standard practice, they took the maximum allowable length of time for the photos to become public.
Two devices were submitted to the FCC at the same time, with photos of the device being confidential until the same later date. One device has released and the other has not. You can draw your own conclusions from there.